2005-10-28 Dual Nodes on Docenten
10 nodes on Docenten have two processors and jobs can now be schededuled to run on both.
Ten nodes on Docenten were upgraded to dual nodes as compensation for the downtime due to the bad motherboards. The queue system has now been made aware of this and it is possible to request both processors. This is done through the ppn property in the nodes declaration on submission. For example, a 4-processor job running on two nodes may be declared in the submit script as
...
#PBS -l nodes=2:ppn=2
...
The default is ppn=1. These nodes also have 4 GB memory, as opposed to 1 GB in the other 200 nodes. If a job on a single processor needs the extra memory, this may be declared as
...
#PBS -l nodes=1:bigmem
...
A dual node can only be owned by one job, even if only one processor is used.
